Temperature minus

On a very cold day in January, the temperature started at -12 degrees. The temperature rose 20 degrees during the day. That evening, the temperature fell 10 degrees. What is the temperature at the end of the day?

Correct answer:

t3 =  -2 °C

Step-by-step explanation:

t1=12 °C t2=t1+20=(12)+20=8 °C t3=t210=810=2°C

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